Valve-seat.



H. H. ALDRICH.

VALVE SEAT.

APPLICATION FILED 0:0212. 19m.

1,355,469 Patented July 31,1917.

M/ff i By @WM TUHNEYS BUSCOE E. ALDRICH, OF ALLENTDWN, PENNSYLVANIA.

VALVE-SEAT.

Specification of Letters .'tatent. a'tented July 3l., 1917.

Application filed December 12, 1916. Serial No. 136,461.

lowing is a full, clear, and exact description.

My invention relates to a valve seat par- L ticularly adaptable for valves used in pumps 'for circulating liquids containing abrasive matter in suspension.

An object of the invention is to provide a simple, inexpensive and eiicient valve seat which is provided with means forv maintaining'thecontaoting or wearing surfaces of the seat clean from abrasive substances carried by the liquid which passes through the valve seat.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds,fthe invention consists in the novel construction, combination and arrangement of parts as herein fullyv described, illustrated and claimed. Y

In the accompanying drawings, forming part of the application,.similar characters of reference indicate corresponding parts inal1 the views.

Figure 1 is a section through an inlet valve of a pump, the seat of which valve embodies my invention;

Fig. 2 is an enlarged section through .the valve'seat; and

Fi 3 is a plan view -of the valve seat.

Re erring to the drawings, 5 is an annular valve seat,the end 6 forming the Contact surface of the seat which is to be engaged by a yielding washer 7 of the valve 8.v The va ve seat 5 has an annular groove 9 on the outer periphe .and an annular groove 10 on the contacting surface, the two grooves being in communication at suitable intervals by passage 11 formed in the body of the valve seat. The seat is also provided with an outer annular'shoulder 12 located between the contacting surface land the annular groove 9. This shoulder forms a stop or an abutment for the seat when itis fitted -into position into a body 13 which is to carry the seat. v

The portion-of the outer periphery of the valve seat below the shoulder is preferably tapered to fit tightly a corresponding taper in the body recelving it. The body 13 has a clean water supply 14: to the annular groove. The water is delivered to this annular groove at .a pressure greater than the pressure against which the valve operates; consequently, this clean water will prevent anyv material carried by the liquid pump froml collecting on the-contacting surface ofthe valve seat and thus tacting surface.

Seats as described are particularly adapt-f` able for pumps which carry liquids containing a large amount of sediment, such as sand, coal dirt, etc., and which sediment has a tendency to wear the contacting surface of the seat.

I claim:

An annular valve seat presenting a con- -"\outer periphery tapering from the shoulder prevent wear of the cong towardthe other end of the valve, said valve seat having an annular groove on the tapering1 periphery thereof and passages establis ing communication between the groove on the contacting surface to the groovev on the periphery' v ROSCOE H. ALDRICH. 

